Back and forth on cutting

LightBurn Software Questions
1

Hi everyone :slightly_smiling_face:

I’m writing this message because I’m experiencing a problem with lightburn that I can’t seem to solve.

I have to contour a part on my Omtech max 750 CO2 laser and when previewing in LB I realize that my laser is contouring correctly but going back and forth.

I checked that there were no duplicate lines and that the shape was properly closed using the ALT J command, but nothing helped.

Here’s a video to make things clearer : video

Do you have any idea where this might be coming from?

Thank you,

Bobi

2

Post your lightburn save file here with the UPLOAD file command
→ {047563B1-4EF8-4BB7-B38C-220B7E4EEC66} ←

Then we can look at what your settings are.

3

Hi Jim,

Thank you for your answer.

here is the file :

copie LB.lbrn2 (114,7 Ko)

4

Your shape (looks like half a scissors) is made up of a lot of smaller pieces. I changed them to different colors to make it easier to see.

{791F1CD2-346C-4DE2-8A22-399E934B838B}
{791F1CD2-346C-4DE2-8A22-399E934B838B}817×245 12.7 KB

Join the seperate pieces into a single part and the back and forth movement will be gone.

5

Thank you Jim.

Your comments raise several questions:

  • When I click on the curve under LB I don’t see all these little segments, they appear when I separate them. Then why doesn’t the ALT J command work?
  • How do you join them?

Thanks for your help :slight_smile:

6

Part of the shape is duplicated, you have to remove the duplicate for it to behave correctly.

image
image1030×502 24.3 KB

7

Hi David,

thank you for your answer.

how do you manage to select and move duplicates line? when I try, I don’t get the right line :sweat_smile:

8

This is what I did to delete all the duplicates, it is a bit long winded but it works.

  1. Select object
  2. Ungroup
  3. Select object - break apart Alt+b
  4. Delete duplicates Alt+d
  5. Auto join shape Alt+j

For this shape I found I had to repeat steps 3-5 again to get rid of a remaining duplicate

3 Likes
9

Here is one with less nodes
copie LB_fix.lbrn2 (12.5 KB)

1 Like
10

Thank you very much, it’s works !

:slight_smile:

11

thank you !